for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:The_aeroplane_in_war_(IA_aeroplaneinwar00grahrich).pdf...
Commons Date 1912 Source https://commons.wikimedia.org/w/index.php?title=File%3AThe_aeroplane_in_war_(IA_aeroplaneinwar00grahrich).pdf Author Unknown...
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